The site, discovered by chance when an agricultural road was expanded, is located to the southeast of the town, about 2 km from Laguardia and close to the Carralogroño lagoon. Its curious name refers to an old Brotherhood that existed in the town and that had vineyards in that place.

It was a small-sized natural shelter used as a collective burial about 5,000 years ago. The uniqueness of the burial is due to the atypicality of the place chosen for the burial, the number of individuals, more than 300, found in it and the number of arrowhead injuries and other signs of violence seen in human remains. One of the bodies has a flint arrow stuck in the pelvis, for now the only case in the Basque Country and one of the few in Europe.

In addition to the bones found, personal objects, stone and bone tools were recovered, as well as objects of decoration. These elements are accompanied by some animal remains, among which the skull of a dog with traces of decapitation stands out.

After studying the site, it is concluded that it is a burial used due to the urgent need to bury a large number of bodies in the vicinity, possibly due to a violent confrontation between two human groups.

The exact location of the site is marked, although the material found is deposited in the Álava Archeology Museum, in Vitoria.